CN105136220A - Conductive liquid volume and flow detecting device - Google Patents
Conductive liquid volume and flow detecting device Download PDFInfo
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- CN105136220A CN105136220A CN201510217796.0A CN201510217796A CN105136220A CN 105136220 A CN105136220 A CN 105136220A CN 201510217796 A CN201510217796 A CN 201510217796A CN 105136220 A CN105136220 A CN 105136220A
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Abstract
The invention discloses a conductive liquid volume and flow detecting device which comprises a microcontroller module, a flow sensor, a signal conditioning circuit, a display module and a power supply module, wherein the flow sensor is connected with the microcontroller module through the signal conditioning circuit, the display module is connected with the microcontroller module, and the power supply module supplies power to the microcontroller module, the flow sensor, the signal conditioning circuit and the display module. The conductive liquid volume and flow detecting device is high in measuring precision, stability and reliability. A magnetic field is generated by output excitation signal driving the excitation coils of the flow sensor, the induction electrodynamic potential output by the flow sensor is acquired and processed, and the volume and flow of the conductive liquid is accurately calculated.
Description
Technical field
The present invention relates to a kind of flowmeter, particularly relate to a kind of conducting liquid volumetric flow rate pick-up unit, belong to flow detection control field.
Background technology
Electromagnetic flowmeter is a kind of measuring instrument measuring conducting medium volumetric flow rate, has that measuring accuracy is high, good stability, reliability high.Electromagnetic flowmeter is except can measuring the flow of general conducting liquid, also can measure the volumetric flow rate of liquid-solid two-phase liquid, high viscosity liquid and salt, strong acid, highly basic liquid, can be widely used in the industrial technology departments such as cement, chemical industry, light textile, metallurgy, mine, papermaking, medicine, plumbing, food and drink, environmental protection, performance, the economic benefit of q&r on above-mentioned enterprise of its product have important impact.Traditional electrical magnetic flowmeter generally adopts the single-chip microcomputer of 8 or 16, and single-chip microcomputer handling property is few compared with weak and peripheral interface, simultaneously improperly does low power dissipation design; For battery-powered electromagnetic flowmeter, system need use 32 bit processors of low-power consumption, high treatability.
Such as application number is a kind of electromagnetic flowmeter of " 201110090018.1 ", and differential noise measuring is large value by it, improves the reliability of abnormality juding.This electromagnetic flowmeter by from during positive excitation to without the transition during excitation to through specified time limit without (T1) during being set to the 1st during excitation, by from during negative excitation to without the transition during excitation to through specified time limit without (T2) during being set to the 2nd during excitation, with regard to (T2) during (T1) and the 2nd during each 1st obtain detecting electrode (4a) now produce voltage sum that voltage and detecting electrode (4b) produce as interelectrode voltage and, according to this interelectrode voltage and, judge exception (the emptying detection of electromagnetic flowmeter, it is first-class that the foreign matter of insulativity is attached to electrode).
And for example application number is a kind of electromagnetic flowmeter of " 201110049402.7 ", comprise sensor and converter, described sensor comprises field coil, electrode, conduit, described converter comprises excitation driving, CPU (central processing unit), electrode signal measuring unit, and described excitation driving circuit sends exciting current; Especially, described exciting current has the excitation frequency of the uneven number times frequency division for power frequency.Compared to prior art, the interval of adjacent two-stage excitation frequency is less, and choice is larger, realizes low frequency noises impact to be down to taking into account of minimum and stable output.But measuring accuracy needs to be improved further.
Summary of the invention
Technical matters to be solved by this invention provides for the deficiency of background technology the conducting liquid volumetric flow rate pick-up unit that a kind of measuring accuracy is high, good stability, reliability are high.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
A kind of conducting liquid volumetric flow rate pick-up unit, comprise micro controller module, flow sensor, signal conditioning circuit, display module and power module, described flow sensor connects micro controller module by signal conditioning circuit, described display module is connected with micro controller module, and described power module is micro controller module, flow sensor, signal conditioning circuit and display module provide required electric energy;
Wherein, flow sensor, for generation of induction electromotive force;
Signal conditioning circuit, converts digital signal to for the induction electromotive force produced by flow sensor, and then transfers to micro controller module;
Micro controller module, for calculating the volumetric flow rate of conducting liquid according to the digital signal of Faraday's electromagnetic induction law and reception, is specifically calculated as follows:
Wherein, q
vfor the volumetric flow rate of conducting liquid, D is measuring tube internal diameter, and L is the effective length of measuring tube, and k is magnetic induction constant, and V is induction electromotive force, and B is magnetic induction density;
Display module, for showing the volumetric flow rate of the conducting liquid that micro-control module calculates in real time.
As the further preferred version of a kind of conducting liquid of the present invention volumetric flow rate detection system, described micro controller module adopts EFM32 microcontroller.
As the further preferred version of a kind of conducting liquid of the present invention volumetric flow rate detection system, described display module is LCD display.
As the further preferred version of a kind of conducting liquid of the present invention volumetric flow rate detection system, described flow sensor is vortex flow sensor.
As the further preferred version of a kind of conducting liquid of the present invention volumetric flow rate detection system, described power module adopts chargeable lithium cell.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
1, measuring accuracy of the present invention is high, good stability, reliability are high;
2, the present invention adopts EFM32 microcontroller, and it has excellent low power consumption characteristic, and EFM32 kernel adopts Cortex-M3 design, has very strong expanded function;
3, the present invention drives the field coil of flow sensor to produce magnetic field by exporting excitation signal, and the induction electromotive force that responsible Acquire and process flow sensor exports, and then accurately calculate the volumetric flow rate of conducting liquid.
Accompanying drawing explanation
Fig. 1 is structure principle chart of the present invention.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
As shown in Figure 1, a kind of conducting liquid volumetric flow rate pick-up unit, comprise micro controller module, flow sensor, signal conditioning circuit, display module and power module, described flow sensor connects micro controller module by signal conditioning circuit, described display module is connected with micro controller module, and described power module is micro controller module, flow sensor, signal conditioning circuit and display module provide required electric energy;
Wherein, flow sensor, for generation of induction electromotive force;
Signal conditioning circuit, converts digital signal to for the induction electromotive force produced by flow sensor, and then transfers to micro controller module;
Micro controller module, for calculating the volumetric flow rate of conducting liquid according to the digital signal of Faraday's electromagnetic induction law and reception, is specifically calculated as follows:
Wherein, q
vfor the volumetric flow rate of conducting liquid, D is measuring tube internal diameter, and L is the effective length of measuring tube, and k is magnetic induction constant, and V is induction electromotive force, and B is magnetic induction density;
Display module, for showing the volumetric flow rate of the conducting liquid that micro-control module calculates in real time.
Wherein, described micro controller module adopts EFM32 microcontroller, and described display module is LCD display, and described flow sensor is vortex flow sensor, and described power module adopts chargeable lithium cell.
The principle of work of electromagnetic flowmeter is based on Faraday's electromagnetic induction law.In electromagnetic flowmeter, the conducting medium in measuring tube is equivalent to the conducting metal bar in faraday's test, and two solenoids at upper and lower two ends produce stationary magnetic field.When there being conducting medium to flow through, then induced voltage can be produced, the induced voltage of two electrode measurements generations of pipe interior.Measuring channel realizes the electromagnetic isolation with fluid and potential electrode by nonconducting liner.
The main control MCU of electromagnetic flowmeter can choose EFM32TG840F32 or EFM32G840F128 of band LCD driving force, due to EFM32 each series of product between corresponding model pin directly compatible, user can carry out function cutting or upgrading according to actual items functional requirement.Main control MCU exports excitation signal by DA and drives the field coil of flow sensor to produce magnetic field, and is responsible for the induction electromotive force of Acquire and process flow sensor output, and then calculates the volumetric flow rate of conducting liquid.
The principal feature of electromagnetic flowmeter: sensor construction is simple, does not have mechanical rotation measurement component; In measuring process, not by the impact of measured medium temperature, viscosity, density and conductivity; Range ability is extremely wide, and is only directly proportional to the mean flow rate of measured medium, and divides the flow state planted to have nothing to do with rotational symmetry, and is quick on the draw, good linearity.
EFM32 is 32 8-digit microcontrollers of global lowest power consumption, and under the EM2 pattern that RTC, DMA can run, static current of lcd is only 900nA, can be low to moderate 600nA, and only have 20nA especially when not preserving RAM data under not running the pattern of RTC.Meanwhile, sheet is integrated with low-power consumption peripheral hardware especially: under low-power consumption UART and I2C can run on EM2 pattern, transmitting-receiving and the data identification that can realize data under CPU sleep pattern are waken up.Because Electromagnetic Flow counts powered battery, have certain requirement to power consumption, even can be controlled the power supply of each module by EFM32 in the occasion higher to power consumption requirements, improve its stand-by time to greatest extent, therefore the low-power consumption of EFM32 has obvious advantage.
Those skilled in the art of the present technique are understandable that, unless otherwise defined, all terms used herein (comprising technical term and scientific terminology) have the meaning identical with the general understanding of the those of ordinary skill in field belonging to the present invention.Should also be understood that those terms defined in such as general dictionary should be understood to have the meaning consistent with the meaning in the context of prior art, unless and define as here, can not explain by idealized or too formal implication.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.By reference to the accompanying drawings embodiments of the present invention are explained in detail above, but the present invention is not limited to above-mentioned embodiment, in the ken that those of ordinary skill in the art possess, makes a variety of changes under can also or else departing from the prerequisite of present inventive concept.
Claims (5)
1. a conducting liquid volumetric flow rate pick-up unit, it is characterized in that: comprise micro controller module, flow sensor, signal conditioning circuit, display module and power module, described flow sensor connects micro controller module by signal conditioning circuit, described display module is connected with micro controller module, and described power module is micro controller module, flow sensor, signal conditioning circuit and display module provide required electric energy;
Wherein, flow sensor, for generation of induction electromotive force;
Signal conditioning circuit, converts digital signal to for the induction electromotive force produced by flow sensor, and then transfers to micro controller module;
Micro controller module, for calculating the volumetric flow rate of conducting liquid according to the digital signal of Faraday's electromagnetic induction law and reception, is specifically calculated as follows:
Wherein, q
vfor the volumetric flow rate of conducting liquid, D is measuring tube internal diameter, and L is the effective length of measuring tube, and k is magnetic induction constant, and V is induction electromotive force, and B is magnetic induction density;
Display module, for showing the volumetric flow rate of the conducting liquid that micro-control module calculates in real time.
2. a kind of conducting liquid volumetric flow rate detection system according to claim 1, is characterized in that: described micro controller module adopts EFM32 microcontroller.
3. a kind of conducting liquid volumetric flow rate detection system according to claim 1, is characterized in that: described display module is LCD display.
4. a kind of conducting liquid volumetric flow rate detection system according to claim 1, is characterized in that: described flow sensor is vortex flow sensor.
5. a kind of conducting liquid volumetric flow rate detection system according to claim 1, is characterized in that: described power module adopts chargeable lithium cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510217796.0A CN105136220A (en) | 2015-04-30 | 2015-04-30 | Conductive liquid volume and flow detecting device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510217796.0A CN105136220A (en) | 2015-04-30 | 2015-04-30 | Conductive liquid volume and flow detecting device |
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| CN105136220A true CN105136220A (en) | 2015-12-09 |
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| CN201510217796.0A Pending CN105136220A (en) | 2015-04-30 | 2015-04-30 | Conductive liquid volume and flow detecting device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106017584A (en) * | 2016-07-22 | 2016-10-12 | 无锡信大气象传感网科技有限公司 | Monitoring system for liquid volume flow based on filter circuit and power manager |
| CN106092227A (en) * | 2016-07-22 | 2016-11-09 | 无锡信大气象传感网科技有限公司 | Liquid volume flow monitoring system based on three-stage amplifier and power supervisor |
| CN108981831A (en) * | 2018-05-30 | 2018-12-11 | 苏州树云网络科技有限公司 | A kind of flow detector based on metal-oxide-semiconductor |
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| CN1455229A (en) * | 2002-04-30 | 2003-11-12 | 长春市宏泰仪器设备经销有限公司 | Flowmeter microcomputer monitoring system |
| JP2006313113A (en) * | 2005-05-09 | 2006-11-16 | Mitsubishi Electric Corp | Electromagnetic flowmeter and detecting device of electrode dirt thereof |
| CN202188868U (en) * | 2011-01-26 | 2012-04-11 | 淮阴工学院 | Converter of electromagnetic flow meter |
| CN204214486U (en) * | 2014-10-22 | 2015-03-18 | 中山欧麦克仪器设备有限公司 | The electromagnetic flowmeter that a kind of battery-efficient rate is powered |
-
2015
- 2015-04-30 CN CN201510217796.0A patent/CN105136220A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1455229A (en) * | 2002-04-30 | 2003-11-12 | 长春市宏泰仪器设备经销有限公司 | Flowmeter microcomputer monitoring system |
| JP2006313113A (en) * | 2005-05-09 | 2006-11-16 | Mitsubishi Electric Corp | Electromagnetic flowmeter and detecting device of electrode dirt thereof |
| CN202188868U (en) * | 2011-01-26 | 2012-04-11 | 淮阴工学院 | Converter of electromagnetic flow meter |
| CN204214486U (en) * | 2014-10-22 | 2015-03-18 | 中山欧麦克仪器设备有限公司 | The electromagnetic flowmeter that a kind of battery-efficient rate is powered |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106017584A (en) * | 2016-07-22 | 2016-10-12 | 无锡信大气象传感网科技有限公司 | Monitoring system for liquid volume flow based on filter circuit and power manager |
| CN106092227A (en) * | 2016-07-22 | 2016-11-09 | 无锡信大气象传感网科技有限公司 | Liquid volume flow monitoring system based on three-stage amplifier and power supervisor |
| CN108981831A (en) * | 2018-05-30 | 2018-12-11 | 苏州树云网络科技有限公司 | A kind of flow detector based on metal-oxide-semiconductor |
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Application publication date: 20151209 |